T3263-1.hs:25:3: Warning:
    A do-notation statement discarded a result of type ‘Int’
    Suppress this warning by saying ‘_ <- nonNullM’
    or by using the flag -fno-warn-unused-do-bind

T3263-1.hs:35:3: Warning:
    A do-notation statement discarded a result of type ‘Int’
    Suppress this warning by saying ‘_ <- nonNullM’
    or by using the flag -fno-warn-unused-do-bind